zlib/acinclude.m4

   1 # FIXME: We temporarily define our own version of AC_PROG_CC.  This is
   2 # copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS.  We
   3 # are probably using a cross compiler, which will not be able to fully
   4 # link an executable.  This should really be fixed in autoconf
   5 # itself.
   6
   7 AC_DEFUN(LIB_AC_PROG_CC,
   8 [AC_BEFORE([$0], [AC_PROG_CPP])dnl
   9 AC_CHECK_PROG(CC, gcc, gcc)
  10 if test -z "$CC"; then
  11   AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
  12   test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
  13 fi
  14
  15 AC_PROG_CC_GNU
  16
  17 if test $ac_cv_prog_gcc = yes; then
  18   GCC=yes
  19 dnl Check whether -g works, even if CFLAGS is set, in case the package
  20 dnl plays around with CFLAGS (such as to build both debugging and
  21 dnl normal versions of a library), tasteless as that idea is.
  22   ac_test_CFLAGS="${CFLAGS+set}"
  23   ac_save_CFLAGS="$CFLAGS"
  24   CFLAGS=
  25   AC_PROG_CC_G
  26   if test "$ac_test_CFLAGS" = set; then
  27     CFLAGS="$ac_save_CFLAGS"
  28   elif test $ac_cv_prog_cc_g = yes; then
  29     CFLAGS="-g -O2"
  30   else
  31     CFLAGS="-O2"
  32   fi
  33 else
  34   GCC=
  35   test "${CFLAGS+set}" = set || CFLAGS="-g"
  36 fi
  37 ])